Aircraft Engines and Engine Parts - Introduction

Introduction
This industry includes establishments primarily engaged in manufacturing aircraft engines and engine parts. This industry also includes establishments owned by aircraft engine manufacturers and primarily engaged in research and development on aircraft engines and engine parts, whether from enterprise funds or on a contract or fee basis. Also included are establishments engaged in repairing and rebuilding aircraft engines on a factory basis. Establishments primarily engaged in manufacturing guided missile and space vehicle propulsion units and parts are classified in SIC 3764: Guided Missile and Space Vehicle Propulsion Units and Propulsion Unit Parts; those manufacturing aircraft intake and exhaust valves and pistons are classified in SIC 3592: Carburetors, Pistons, Piston Rings, and Valves; and those manufacturing aircraft internal combustion engine filters are classified in SIC 3714: Motor Vehicle Parts and Accessories. Establishments primarily engaged in the repair of aircraft engines, except on a factory basis, are classified in SIC 4581: Airports, Flying Fields, and Airport Terminal Services; and research and development on aircraft engines on a contract or fee basis by establishments not owned by aircraft engine manufacturers are classified in SIC 8731: Commercial Physical and Biological Research.